Cannot get rid of AVG Nation

S H, Have a look @ this article (https://support.avg.com/SupportArticleView?q=AVG+Nation&urlname=How-to-uninstall-AVG-Nation-search-homepage-and-toolbar-from-your-browser&l=en_US).
AVG Guru

Hi.  AVG Nation appears everytime I load a new tab in Firefox.  I have not installed it and don't want it.  It doesn't seem to be possible to uninstall this.  So far I have
- checked for it in Add or Remove Programs, but its not there
- unistalled and reinstalled firefox
- checked firefox toolbars / add-ins
- unistalled AVG Antivirus
- ran Malwarebytes
- ran AdwCleaner
- ran Junkware Removal Tool
- searched for Nation, infospace

And its still there!  Please help!

S H, Have a look @ this article (https://support.avg.com/SupportArticleView?q=AVG+Nation&urlname=How-to-uninstall-AVG-Nation-search-homepage-and-toolbar-from-your-browser&l=en_US).
AVG Guru